A senior Lib Dem tells me former care minister Paul Burstow's idea on cutting winter fuel payments "has no endorsement from anyone in the party."
But they do tell me that there is "no harm coming up with ideas" on how to fund social care.
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The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.
Prime Minister Theresa May announced the decision from Downing Street.
A man, apparently armed with a small axe and a large stick, was detained close to the event and police cleared the area as a precaution.